/Engine/Source/Editor/CurveEditor/Public/CurveModel.h
Helper function for adding a single key to this curve
[TOptional](API\Runtime\Core\IO\TOptional)< [FKeyHandle](API\Runtime\Engine\Curves\FKeyHandle) > AddKey ( const [FKeyPosition](API\Editor\CurveEditor\FKeyPosition) & NewKeyPosition, const [FKeyAttributes](API\Editor\CurveEditor\FKeyAttributes) & InAttributes )